Electron temperature fluctuation studies can help to understand the nature of
the turbulent transport in to-kamak plasmas. At Tore Supra, a 32-channel
heterodyne ECE radiometer has been upgraded with two chan-nels of 100 MHz
bandwidth and tunable central frequencies allowing the shift of the plasma
sample volume in the radial direction. With the sufficiently large video
bandwidth and the long sampling time, it is possible to reduce significantly
the thermal noise and to identify "true" high frequency components up to 200
kHz from the cross-correlation between these channels. First results of
temperature fluctuation measurements on Tore Supra are reported in this paper.Comment: 12th International Congress on Plasma Physics, 25-29 October 2004,
Nice (France
